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DOI : ,    Vol.4, No.2, 27 ~ 37, 1996
Title
Influeace of Surface Properties and ζ-Potential af Particle on Coagulation / Flocculation
김동수Dong Su Kim,곽종운Jong Woon Kwak
Abstract
Surface charge of particle was possible to be modified by only pH adjustment to be coagulated without any addition of coagulant. The particle size and surface area was evaluated to greatly influence on coagulation and flocculation. Two different raw waters showed the different coagulation response even when they were coagulated by the same metal salts. As a result, floc growth was intercorrelated with particle size distribution contained in the raw water, in which finer particles needed much more dosages. Coagulation seemed to be occurred at the surface between two particles. In particle surface effect, neutralization of surface charge by metal ions was remarkably dependent upon coagulant basicity as a chemical factor and metal salts with a higher basicity exhibited a good result for charge balance in water. The dosage required for neutralizing a high turbidity of raw water was rather affected by particle sizes than their magnitudes, suggesting that the initial turbidity is not a main factor for determining an optimal dosing rate. Such effect was verified in the treatment of storm water.
Key Words
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